Valve for pumps



Patented June 26, 1928. 5

UNITEDSTATES PATENT. OFFICE.

PERCY AULAR, OF TITUSVILLE, PENNSYLVANIA, ASSIGNOR TO THE'TITUSVILLEIRON WORKS COMPANY, OF TITUSVILLE,. PENNSYLVANIA, AJCORPOR ATION OFPENNSYLVANIA.

VALVE FOR PUMPS.

Application filed-December 28, 1926. Serial No. 157389.

This invention relatestoa valve mechanism which is more particularlyintended for use in slush pumps. I r i Ordinarily such pumps have theirvalve seats forced into a passage in the pump body leading to the pumpcylinder and a cover is, placed over the opening in the body throughwhich the seat is introduced, which cover normally serves as a bufferand a re tainer for the spring whereby the valve is yieldingly held inengagement with the valve seat. It has been found in practice thatthefluid under pressure has a tendency to wear the valve seat so that itwill leak and also todestroy the adjacent parts ofthe passage leading tothe pump cylinder dueto the abrasive action. of the. grit, sand and thelike in the fluid being pumped, thus making it necessary in acomparatively short time to replace. the entire body of the pump whichcontains the cylinders. I y 1 It is the purpose of this invention topro.- vide a pump in which such expensive re.- placement is renderedunnecessary and to that end this invention consists generally inmounting the valve mechanism in a. cage or housing which is separatefrom the body of the pump but detachably connected therewith, whichhousing and the parts mounted thereon take practically the entireaction, of the material beingpumped and can be readily replaced whenworn outwithout necessitating replacement of the body containing thecylinderythereby effecting a considerable economy in the industry whichemploys such pumps.

- In theaccompa-nying drawings: V Figure 1 is a fragmentary vertical.section of one form of valve mechanism for slush pumps embodying myimprovements. Figure 2 is a horizontal sectiontaken on line 2-2, Fig.1., Figure 3 isafragmentary section similar to Fig. 1 showing a slightmodification of my invention.

Similar characters of reference indicate like parts in the severalfigures of the drawings. I

The numeral 9 represents the body of the pump which may contain anydesired number of pump cylinders, but in common practice two cylinders.are employed and the body is provided with inlet and outlet passagesthrough which the fluid to bepumpedv is conducted to and delivered fromopposite ends of the cylinders. V Inasmuch as the in lot and outletpassages are substantially body is provided with an opening 14 lead:

ing to. the exterior of. the pump body. Around the outer end of thisopening 14 the pump body is provided with an annular outwardly facingshoulder 15. y

Arranged withinthe .pocketz12 a valve cage or housing 16: preferably ofcircular form which has its inner end facing the inner shoulder 13 ofthe. body and provided at its outergend' with a head 17 which forms acover for closing the opening 14, and within the cage the sameii-sprovided-with a cavity or conduit 18 one end 7 of which is shoulder 13and opposite this shoulder the circularand opens lengthwise through theinner end of the cagewhile its. other end'8 opens laterally through thesideof the cage in register with the correspondingparts. 10, ll 1 of thepassage of the pump body. leaktight joint is produced'between the innerend ofthe valve cage and the inner shoulder 13 of the body by a packing19 consisting preferably of a rubber ring-interposed between thesesurfaces, and a leakage'through the joint between the head of the cageand" the body of the pump is likewise prevented by a packing. 20 havingvpreferably the form; of a rubber ring clamped between the outershoulder of the pump body and themwardly facing shoulder on the outerend of the valve cage. This cage is removably secured in'tbe pocket ofthe pump body by suitable fastenings consisting preferably of aplurality of bolts 21 passing through the external marginal arts of theca e or housing and into the adiacent parts of the pump body. Fitting inthe. longitudinal circular opening 7 of the cage is a valve sleeve ortubular bushing 22 which is provided at its inner end withan inwardlyfacing valve seat 23 and on its periphery with an outwardly facingannular shoulder 24 which engages the inner side of the pocket 18 aroundthe longitudinal opening 7 On the outer end. of the valve bushing theperiphery of. the same is provided with. an

annular locking groove 25whi'ch receives the bore portion of theinner'packing ring 19 Owing to the elasticity ofthe latter the lattercan be suificiently" sprungto pass over the outer end of the valvebushing and then spring into the groove 25. By this means the ring 19performs the dual function of a packing to prevent leakage between theinner end of. the cage and the pump body andalso as a locking means: forholding the valve bushing in its opening in the cage so that dislacement of thesemembers relatively to eac other is prevented.

The valve in the present instance consists of a disk 26 of 'balata'or'some fibrous or elastic material which is arranged within thecavityof the housing or cage and mov able toward and from the seat 23 of the:valve bushing. for closing or opening? the passageway through the valvemechanism. on its top or rear side this valvedisk is engaged by a topplate 27 and on. its underside or frontsidethis valve. disk is engagedby a bottom plate 28 which is provided with depending arms .29slidingagainst the bore of the valve bushing, saidbottom'plate and armstogether forming a guide whereby the valve disk is maintained in properposition during its movement toward and fromthe valve seat on thebushingThe top and. bottomplates 27, 28, are clam" ed against opposite sidesof'the valvedisk a fastening devicefconsisting preferably of a bolt3Qengaqing the central parts of the same.

Forjt e p urpose ofcausing the valve to close promptly spring 31"preferably of helical form is employed. which spring engages'itsloweror innerfend with the top plate'of the valve disk while its upper orouterendrengages with the bottom of. a recess32. injthehead or coverofithe cage, thereby servingto hold the valve yieldingly in its closedposition. This valve .is opened by pressureifagainst the underside ofthe same and is closedby pressure as plied'to the upperside thereof'in awell kn Wama ne -f When'thevalve disk, bushing, cage 'or associatedparts become worn to such an extent that the same leak then the entirevalve mechanism can be removed as a unit from the passage of the pumpbody by first detaching the bolts 21 and then lifting the cage orhousing out of the Docket of the passage. Suchlifting is facilitated bymeans of a ring which is secured to the "outer end of the cage andadapted to be connected with a hoisting device of any suitablecharacter. After the. cage. is. removed the lower or inner packing. ringmay besprung out of the groove of the valveibushingrand then the. lattermay be. removed from the cage after taking out the upper valve plate,guide, bolt and'spring. A new valve bushing, disk and other parts maynow besubstituted for thoseinthe cage whieh were worn and then the cagemay be restored in" the pump body as a unit in its'norma'lposik tion.

" As shown in Fig. 1, the face 34 of the valve disk is flat and enga"swith a e'o'r respondingflat valve seat "2 but if desired t e marginalpart of the faceof the valve disk may be conical, asshown ttain Fig. 3,andco-operate with a seat 36015 correspending shape at the upper endofthe valve bushing, as shown in the same figurel Each of these formsofiny' invention providesa combination of parts which can be easilyremoved when worn and replaced by newparts infthe pump bodyas a. unit,thereby avoiding the necessity of'replacing the body of the pumpcontaining the cyl; inders ashas been necessarvhereto'fore when III thepartsformed"integrally withfthe bOdY containing the cylinders'becomeworn by the abrasiye' a'ction ofthe mnd laden fluid which was pumped inrotary drilling or similar i ise I claim as my. invention 2 1, A valvemechlnism for pumps compris: ing a bO dy haYiIlY a passage for thefluid, an opening exten ing from said passage to the exterior ofthe'bodyand aninternal shoulder around said passage, a cage movable through saidopening and having a conduit registering with said assage; a valvebushing arranged in said conduitand provided at its inner end with avalve seat and with an inner shoulder engaging the inner side of said.cage and provided atits outer end with an ex e nai'groqveg a packingarranged. betweenfsaid internal shoulr the sie ai age dnesine i aiaware, a v ran d in th a e ndle w d nd from sa a a 2. A valve mechanismfor pumps comprising. a body "having a passagefor the fluid, anopeningextending "from'said pas sage to the exterior of the body andan'internal shoulder around said passage, a cage movable through saidbpeningand' having a conduit registering with said passage, 21 nalshoulder and the inner end of said cage valve bushing arranged in saidconduit and and engaging with said groove, and a valve provided at itsinnerend with a valve seat arranged in the cage and movable toward 1 andwith an inner shoulder engaging the and from said seat.

5 inner side of said cage and provided at its In testimony whereof Ihereby aflix my outer end with an external groove, an elastic signature.packing ring arranged between 'said interv PERCY W. AULAR.

